Hi,

As the manufacturer indicates, BenQ SW271 has a 14bits 3D-LUT.
Could this display be calibrated with ColourSpace?
In the BenQ monitor user guide are listed only two BenQ displays: PV270 and SW270C.

The user guide actually says the PV270, SW270C, SW321C, SW271C, SW272Q, and SW272U displays are the only BenQ displays with viable 3D LUTs.
That is information from BenQ directly.
While other displays have a form of LUT capability, it is not a true 3D LUT, and so cannot be calibrated with any externally generated 3D LUT.
(For example, the LUT in the SW271 is 'compressed' so not a true 3D LUT - it is effectively a 1D LUT and 3x3 matrix.)

Steve